We discussed two implementations of threads $-$ threads in kernel space and threads in user space.$$ Which of the following statements is true?

Group of answer choices

Threads in user space and threads in kernel space exhibit the same efficiency, it is just a matter of who controls the thread that creates the difference.

Threads in a process in user space can have their own scheduler distinct from the OSes scheduler handled by the runtime environment.

Threads in user space can cause an entire to process to block if an individual thread blocks.

Threads in kernel space can switch back and forth between threads within the same process as part of the OSes scheduler.